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Calculați: s=1+3+5+7+...…+201

Răspuns :

s=1+3+5+...+197+199+201
s=201+199+197+...+5+3+1
2s=202+202+202+...+202
2s=202x101
2s=20402
s=20402:2=10201
Răspuns=10201